Avoid rounding down viewport dimensions in Media Queries

third_party/WebKit/Source/core/css/MediaValues.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MediaValues_h
 #define MediaValues_h
 
 #include "core/CoreExport.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "public/platform/PointerProperties.h"
@@ skipping 10 matching lines @@
 class CORE_EXPORT MediaValues : public RefCountedWillBeGarbageCollectedFinalized<MediaValues> {
 public:
 
     virtual ~MediaValues() { }
     DEFINE_INLINE_VIRTUAL_TRACE() { }
 
     static PassRefPtrWillBeRawPtr<MediaValues> createDynamicIfFrameExists(LocalFrame*);
     virtual PassRefPtrWillBeRawPtr<MediaValues> copy() const = 0;
     virtual bool isSafeToSendToAnotherThread() const = 0;
 
-    static bool computeLengthImpl(double value, CSSPrimitiveValue::UnitType, unsigned defaultFontSize, unsigned viewportWidth, unsigned viewportHeight, double& result);
+    static bool computeLengthImpl(double value, CSSPrimitiveValue::UnitType, unsigned defaultFontSize, double viewportWidth, double viewportHeight, double& result);
     template<typename T>
-    static bool computeLength(double value, CSSPrimitiveValue::UnitType type, unsigned defaultFontSize, unsigned viewportWidth, unsigned viewportHeight, T& result)
+    static bool computeLength(double value, CSSPrimitiveValue::UnitType type, unsigned defaultFontSize, double viewportWidth, double viewportHeight, T& result)
     {
         double tempResult;
         if (!computeLengthImpl(value, type, defaultFontSize, viewportWidth, viewportHeight, tempResult))
             return false;
         result = clampTo<T>(tempResult);
         return true;
     }
     virtual bool computeLength(double value, CSSPrimitiveValue::UnitType, int& result) const = 0;
     virtual bool computeLength(double value, CSSPrimitiveValue::UnitType, double& result) const = 0;
 
-    virtual int viewportWidth() const = 0;
-    virtual int viewportHeight() const = 0;
+    virtual double viewportWidth() const = 0;
+    virtual double viewportHeight() const = 0;
     virtual int deviceWidth() const = 0;
     virtual int deviceHeight() const = 0;
     virtual float devicePixelRatio() const = 0;
     virtual int colorBitsPerComponent() const = 0;
     virtual int monochromeBitsPerComponent() const = 0;
     virtual PointerType primaryPointerType() const = 0;
     virtual int availablePointerTypes() const = 0;
     virtual HoverType primaryHoverType() const = 0;
     virtual int availableHoverTypes() const = 0;
     virtual bool threeDEnabled() const = 0;
     virtual const String mediaType() const = 0;
     virtual WebDisplayMode displayMode() const = 0;
     virtual bool strictMode() const = 0;
     virtual Document* document() const = 0;
     virtual bool hasValues() const = 0;
 
     virtual bool isCached() const { return false; }
 
 protected:
-    int calculateViewportWidth(LocalFrame*) const;
-    int calculateViewportHeight(LocalFrame*) const;
+    double calculateViewportWidth(LocalFrame*) const;
+    double calculateViewportHeight(LocalFrame*) const;
     int calculateDeviceWidth(LocalFrame*) const;
     int calculateDeviceHeight(LocalFrame*) const;
     bool calculateStrictMode(LocalFrame*) const;
     float calculateDevicePixelRatio(LocalFrame*) const;
     int calculateColorBitsPerComponent(LocalFrame*) const;
     int calculateMonochromeBitsPerComponent(LocalFrame*) const;
     int calculateDefaultFontSize(LocalFrame*) const;
     const String calculateMediaType(LocalFrame*) const;
     WebDisplayMode calculateDisplayMode(LocalFrame*) const;
     bool calculateThreeDEnabled(LocalFrame*) const;
     PointerType calculatePrimaryPointerType(LocalFrame*) const;
     int calculateAvailablePointerTypes(LocalFrame*) const;
     HoverType calculatePrimaryHoverType(LocalFrame*) const;
     int calculateAvailableHoverTypes(LocalFrame*) const;
     static LocalFrame* frameFrom(Document&);
 
 };
 
 } // namespace
 
 #endif // MediaValues_h